Filter septum supporting means



June 9', 1942. A. o. BROOKS FILTER SEPTUM SUPPORTING MEANS Filed Dec. 14, 1940 ARLAND OTTIS BROOKS.

INVENTOR.

Patented June 9, 1942 UNITED STAT FILTER SEPTUM SUPRORTING MEANS Arlaml Ottls Brooks, Kimmswlck, Mo., asslgnor to National LeadOompany, New corporation of New Jersey York, N. Y., a

Application December 14, 1940, Serial No. 370,003

G'Claims'.

The invention relates to filters, particularly.

rotary. type vacuum filters. a

Rotary vacuum filters are well known in the industrial arts. They consist essentially of a oi sections which are alternatively under vacuum and pressure and that simultaneously while at least one section is under pressure the remaining.

sections are under vacuum. The individual-secseptum supporting units and end units. The

end units function as divisionstrip's separating the same time, fit tightly to the drum surface hollow rotary drum the surface of which supover its entire' length, thus making it possible for ports a layer of solids being filtered while the one section to be under pressure while adjacent interior is provided with means which alternasections are under vacuum. tively, as the drum rotates, applies vacuum or The principal object of the present invention pressure to the surface supporting the solids. is to provide a filter septum supporting unit or The drum rotates on its horizontal axis dipm means which by its novel manner-of construction ping into a tank containing a' slurry of the solids is adapted to provide thesame effective filtrate to be filtered. A frictional valve assembly is drainage area as obtainable by the prior art; connected to a fixed pipe, communicating with while at the same time, greatly increasing ,the a vacuum source and to a second fixed pipe. comstrength and life f sai supp n m ns v r municating withapressure, or blow-back, source. s that of the prior art filter septum supporting The valve assembly is so adjusted that-the pormeans. This and other objects of the invention tion of thedrum passing through the slurry of will be apparent from the specification when solids is under vacuum which is communicated considered with the accompanying drawing. through the pipe having branch connections, Figs. 1 and2 represent a preferred embodiment passing through an outlet in the surface of the f the P e inv n iondrum. These branch connections communicate Fla. 1 is a op view in per of the n v with grooved means for supporting the filter fil r s pt m supp t n m n nd la 3 18 e septum. These grooved means and filter septum l .4 bottom view in perspective thereof. extend around the entire surface of the drum. With ref rence o F1!- 1 he n v l fil r I D -i As the drum is rotated by means of suitable support n unit is roov d. 0. ate al y over the mechanism the lower portion of the drum which entire length 0iits p wrh h se Srooves dips into the slurry contained in the tank being are adapted to receive filtrate passing through a 1 under vacuum ci'eated through the vacuum pipes, filter septum and are disposed on the surface of picks a layer of solids upon its surface, the filthe ppor in ni in rallel relation to each trate passing out through the vacuum system. other. They may be parallel with respect to The valve assembly is also so adjusted that the horizontal axis of the unit or positioned at vacuum is maintained over the entire ascending n nc n r l t n h r Th ee grooves. as side of the drum and over about one-half of the n n number 1ml be r o munidescending side. As the layer of solids is car- Cate at H w ri r nn s which in turn ried up the ascending and down that portion as communicate wi h the nress rean vacuum s s of the descending side which is under vacuum, vtem. washing liquid is usually distributed over the wi h reference o s- 2. the novel filter sepsurface of the layer of solids. This liquid is tum ppor n m ns will Preferably have drawn through the layer of solids and the filter beveled-edged sides. II, and are grooved at ll. septum by means of the vacuum; thence through 4.0 These grooves extend l t ral y h n r length the communicating grooves in the filter septum of the unit along the horizontal axis of the drum. support it passes int th uu system, As The invention is not limited to any number of the layer of solids adhering to the filter surface such r ov s b as desired one or. more may be is carried toward the lower half of the descendd d Intersectlns these oov s. 3. at'subw of th drum, th valve assembly'permits 5 stantially right angles and at frequent intervals pressure to be ap lied by m an 1' bl -b k along the length of the unit are recesses, ll. pipe and the groovedfilter septum support to the These recesses, it, are cut through the unit inunder surface of the filter septum, supporting wel'diy from h vel d-ed ed sides thereof at a the layer of solids. In this blow-back operation depth silflicient to es ablis communication at the layer of solids by means of the pressure apw grooves, cut n he op surface of plied, is dislodged from the filter septum and rethe intermediate unit and terminating short of mov d b an uitabl a h a d t the opposite beveled-edged side of the unit. Prefblade. l erably, alternate recesses will cut inwardly from It will be observed that the filter septum suppposi sides of the unit through the beveled porting means of the rotary filter must be made d s e of creating a. stassered relationship- For most elllcient drainage the closed end of the staggered recesses should extend beyond the closed end of the adjacent recesses, ll, on either I tions are formed of a plurality of grooved filter to side. This is accomplished when the length of recess is more than half the width of the filter form channels.

The end units and the intermediate units, l2,

are constructed of any suitable material, for.

instance, wood, and are individually attached to the drum surface in any convenient manner, preserving the above-described arrangement. The

drum surface being usually of wood, the attachment may be made by means of nails, screws and the like.

The. section functions, during the vacuum phase, in the following manner:

A vacuum is created in the groove, I3, by means of the vacuum pipe which communicates through the valve assembly to the vacuum line. The vacuum is communicated through the grooves, l3, to the recesses, l4, and thence throughout the section until ultimately the communication of vacuum is sealed off by the next adjacent end piece. The liquid which is sucked through the filter septum at H, into the recesses, 14, travelsalong the path of the vacuum into the groove 13, and isdrawn through outlet of the vacuum pipe. It will be seen that the path of the vacuum and the filtrate is a staggered one.

The section functions, during the blow-off phase, in the reverse manner. For certain filtering operations, for instance, when a layer of pre coat material is employed, the blow-back phase of the cycle is omitted. It will be understood that the present invention is applicable to rotary filters generallyand is not limited to use only in connection with a rotary filter operated with a blow-back phase.

It is to be observed that the novel construc-- tion of my intermediate units with their staggered recesses affords an effective drainage area equal to that of prior art devices, and in addi tion imparts to the filter septum supporting means an increased strength many times greater than filter septum supporting means of the prior art. For instance, a filter septum supporting means in accordance with the present invention will be about five times as strong as one of the prior art and will generally last longer.

The foregoing description and drawing of my invention have been given merely for illustrative purposes and no undue limitations should be deduced therefrom. It is obvious that.various changes may be made within the scope of the claims appended hereto, and in'the details of construction without departing from the spirit of the invention.

I claim:

l; A filter septum supporting unit having on one surface a plurality of lengthwise extendin grooves adapted to receive filtrate passing through a filter septum, the opposite surface thereof being channelled along its length and provided with a plurality of crosswise recesses of sufiicient depth to establish a communication between the said grooves and channelling said recesses being open at one edge of the filter septum supporting unit and extending only part way across the said unit.

2. A filter septum supporting unit having on one surface a plurality of lengthwise extending grooves parallel to each other and adapted to receive filtrate passing through a filter septum, the opposite surface thereof being channelled along its length and provided with a plurality of crosswise recesses ofsufllcient depth to establish a communication between the said grooves and channelling, said recesses being open at one edge of the filter septum supporting unit and extending only part way across the said unit.

3. A filter septum supporting unit substantially rectangular in shape having on one sur-, face a plurality of grooves parallel with the longer sides of the rectangle and adapted. to receive filtratepassing through a filter septum, the opposite surface thereof being channelled along its length parallel with the longer sides of the rectangle and also provided with a plurality of recesses open at one of the longer sides of the rectangle and extending parallel with the shorter sides of the rectangle part way across the channelled surface at a sufficient depth to establish a communication between the said grooves and channelling.

4. A filter septumsupporting unit substantially rectangular \in shape having on one surface a plurality of grooves parallel with thelonger sides of the rectangle and adapted to receive filtrate passing through a filter septum, the op-' posite surface thereof being channelled along its length parallel with the longer sides of the rectangle and also provided with a plurality of rechannelled surface at a sufficient depth to establish a communication between the said grooves and channelling to permit the passage of filtrate from the grooves into the channelling.

5. A filter septum supporting unit substantially rectangular in shape having on one sur-' face a plurality of grooves parallel with the longer sides of the rectangle and adapted to receive filtrate passing through a filter septum, the opposite surface thereof being channelled along its length parallel with the longer sides of the rectangle and also provided with a plurality of recesses alternately opening at opposite longer sides of the rectangle and extending parallel with the shorter sides of the rectanglemore than half way across the channelled surface, at a suflicient depth to establish a communicationbetween the said grooves and channelling to permit the passage of filtrate from the grooves into the phannelling.

6. The combination in a rotary filter of the character described of a hollow drum; afllter septum on the surface of said drum and meansv interposed between the drum and the filter septum for supporting the said. filter septum, the supporting means comprising a plurality of .in dividual units substantially rectangular in shape having on the surface in contact with'the 'filter receive filtrate passing through the filter septum,

the opposite surface in contact with the hollow drum being channelled along its length parallel L with the longer sides of the rectangle and also provided with a plurality of recesses alternately opening at opposite longer sides of the rectangle and extending parallel with the shorter sides of the rectangle part way across the channelled surface at a sufiicient depth to establish a communi- I cation between the said grooves and channelling to permit the passage of filtrate from the groov into the channelling.

ARLAND O'IIIS BROOKS. 

